What to do if ...
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5
What to do if ...
Cause
Remedy
– Measuring instrument and
probe are not connected to
each other
– Check the connection
between measuring
instrument and probe
– No electrolyte in the
membrane head
– Replace the WP 25i
membrane head
– Cable defective
– Send probe to WTW
– Electronics defective
– Send probe to WTW
Cause
Remedy
– Membrane head
contaminated
– Perform an exterior
cleaning of the probe
according to the
operating manual. Then
wait for at least 15
minutes and recalibrate.
If there is contamination
that cannot be
removed: Replace the
electrolyte solution and
the membrane head
Cause
Remedy
– The electrodes are
contaminated or the probe
is poisoned
– Clean the electrodes
according to the
operating manual-
The measuring
instrument displays
0.0 mg/L or
0 % Sat O
2
(the probe is in air)
Probe cannot be
calibrated
Probe still cannot be
calibrated after the
electrolyte and the
membrane head
have been replaced
